How do you solve solving system by substitution can someone give me the steps plz

Isolate one variable in one of the equations and substituting it into the other equation. *note* in example the first substitution is given to you

Step-by-step explanation:

For example:

-3x-4y=-2

y=2x-5

Substitute -4y with second equation

-3x-4(2x-5)=-2

PEMDAS

-3x-8x+20=-2

-11x+20=-2

Subtract 20 on both sides of the = sign

-11x=-22

Divide both sides

x=2

Plug that into the second equation

y=2(2)-5

y=4-5

y=-1

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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step-by-step explanation:

step-by-step explanation:

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